They also employed someone who could mimic India's famous TV cricket commentator Harsha Bhogle.
To cover their tracks, camera operators avoided wide shots and used close-up shots of players.
The fake umpires followed instructions sent by walkie-talkies, as Russian punters were tricked into betting about $6000 before the scam was shut down.
"They signalled bowlers and batsmen to hit a six, four or get out," inspector Bhavesh Rathod told media.
Labourers and young unemployed were paid about $8 to play the games, which were aired on a YouTube channel named "IPL".
Police were tipped off when the tournament had got to the quarter-final stage.
Betting on cricket is illegal in India. The BBC reported that four people had been arrested.
Meanwhile, genuine commentator Bhogle saw the funny side, saying he wanted to hear his imitator.
"Can't stop laughing. Must hear this 'commentator'," he tweeted.
